Malicious PDF — malware analysis report

Static analysis result for SHA-256 21dfd03cb97769bd…

MALICIOUS

PDF

79.6 KB Created: 2021-09-06 20:54:45 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-10-05
MD5: 938bb4dcc592754de233dc0b80c8e752 SHA-1: d680c78b918a60a1910fbb7859640e753b3d3ce4 SHA-256: 21dfd03cb97769bd176d38c23a07217a7392f78678f59e9f5d03ba42ad48271f
156 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The PDF contains numerous links pointing to compromised WordPress sites, suggesting it's part of a link farm designed to redirect users to malicious content. The ML classifier and ClamAV detection strongly indicate malicious intent, likely for phishing or distributing further malware. No scripts were extracted, but the presence of external URIs and the link farm structure points to a social engineering attack.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9978

Heuristics 6

  • ClamAV: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2568dad23a94d95-d2568dad23a94d95-10044375-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://actionelectric.pt/www/wp-content/plugins/formcraft/file-upload/server/content/files/160fe477b83f0e---31662859712.pdf In PDF document text
    • https://csn-alliance.com/data/files/xajoruginemadexezisew.pdfIn PDF document text
    • https://www.diktu.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609613c08d64e---72835525779.pdfIn PDF document text
    • https://makemycake.gr/wp-content/plugins/super-forms/uploads/php/files/f54hnsg6p6a9ubaekkknoev58h/74178352003.pdfIn PDF document text
    • http://www.tecnotrefg.it/wp-content/plugins/formcraft/file-upload/server/content/files/1607ee1c3c51b4---jajuduw.pdfIn PDF document text
    • https://christembassyromford.org/wp-content/plugins/super-forms/uploads/php/files/2a6dbf418c3c819d9e303d00b9793676/jerosinefi.pdfIn PDF document text
    • http://soundreaming.org/wp-content/plugins/super-forms/uploads/php/files/fd04380815471e185d72ef892a99b947/xozudibatijobig.pdfIn PDF document text
    • https://rainbowfurnitures.com/files/files/37766292018.pdfIn PDF document text
    • http://studiovalecchi.it/userfiles/files/62951593221.pdfIn PDF document text
    • https://vildmarksjagt.dk/userfiles/file/rezavesitokemazazarewi.pdfIn PDF document text
    • https://maplesservice.com/wp-content/plugins/super-forms/uploads/php/files/8dd7f802c458a6fef060d1766f985aeb/66158518505.pdfIn PDF document text
    • https://efnnma.org/files/file/febitadobafir.pdfIn PDF document text
    • https://leavereview.com/customerinterview/ckfinder/userfiles/files/42066162600.pdfIn PDF document text
    • https://dermo.com/wp-content/plugins/formcraft/file-upload/server/content/files/160a1c8a4a46f7---wisorini.pdfIn PDF document text
    • https://www.3dreamchurch.com/wp-content/plugins/super-forms/uploads/php/files/5bb4810bfc050b65f3853396d4380a78/vukitotun.pdfIn PDF document text
    • http://adoriantarla.ro/wp-content/plugins/formcraft/file-upload/server/content/files/16070244bc5abb---21604796832.pdfIn PDF document text
    • http://chatyzvule.cz/uploads/75497633481.pdfIn PDF document text
    • https://desense.eu/uploads/wysiwyg/files/29735731085.pdfIn PDF document text
    • https://ahreco.com/uploads/news_file/23762386197.pdfIn PDF document text
    • https://hoovermaids.com/wp-content/plugins/super-forms/uploads/php/files/6cbe57692aaedef3f92be7d8ece9a11b/54761731460.pdfIn PDF document text
    • http://atek-ent.com/upload/file/86742682461.pdfIn PDF document text
    • https://kayakbranson.com/wp-content/plugins/formcraft/file-upload/server/content/files/160707ec0c4f91---galime.pdfIn PDF document text
    • https://olgapopovaphoto.com/wp-content/plugins/super-forms/uploads/php/files/84823c64d8b88c02d6d4d09b64ede007/fuserawedogenirarunuxuluv.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/cv9VXjIrmdE/uplcv?utm_term=24+hour+time+worksheets+tesPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000cf96.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xCF96 10440 bytes
SHA-256: a58b887e75c9bb320295d74b24d114afd87bb8cc36cb4dceb1517517c969f2b8
font_01_sfnt_off0000e774.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xE774 18936 bytes
SHA-256: ade136997ded89391c12a8c2d3740d35632f895a19360a7d0ed5d342375a2934
font_02_sfnt_off00011880.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x11880 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

Open this report in the interactive analyzer, or submit your own file for analysis.